Bobcat T62 Track Loader Troubleshooting

The Bobcat T62 compact track loader is powered by 146.5 cu.in (2.4L) Bobcat Doosan D24 four-cylinder turbocharged diesel engine with a rated power of 68 hp (50.7 kW) at 2600 rpm. The Bobcat T62 is equipped with a single-speed or two-speed hydrostatic transmission, vertical-lift loader boom, solid-mounted or torsion suspension undercarriage, and rubber tracks. The hydraulic system has a pump with fluid flow rate of 17.6 gpm (66.5 lpm). The hydraulic pressure is 3500 psi (241 bar). The loader has a rated operating capacity of 2150 lbs (953 kg) and tipping load of 6143 lbs (2786 kg). The lift height is 114.5" (2910 mm) to hinge pin, and dump height is 94.3" (2395 mm).

Engine Troubleshooting

Diesel hard to start or doesn't start

Air in fuel system - Bleed fuel system.
Fuel filter element is clogged - Replace the filter element.
Dirty or faulty injection nozzles - Clean or replace injection nozzles.
Water or dirt in fuel system - Drain, flush, and service the system.
Valve clearance is not correct - Correct valve clearance.
Faulty fuel injection pump - Install a new fuel pump or repair.

Engine starts but stalls suddenly

Plugged air cleaner - Install new air cleaner element.
Clogged fuel filter - Replace the filter element.
Problems with fuel injection pump tightness - Inspect fuel injection pump for leaks.
Defective or clogged fuel injectors - Clean or replace fuel injectors.
Faulty fuel injection pump - Rebuild or install a new injection pump.

Engine shuts off suddenly while running

Low coolant temperature - Warm up engine as required.
Dirty fuel filter - Install new filter element.
Air in the fuel system - Air bleeding.
Dirty or faulty injection nozzles - Change fuel injection nozzles.
Wrong setting of fuel injection pump timing - Set it up as required.

Engine shuts off while idling

Low idle speed setting is incorrect - Adjust low idle speed.
Fuel injection pump damage - Repair or install new pump.
Fuel injector fault - Inspect fuel injectors and change as required.
Valve clearance is out of adjustment - Have it adjusted.

Engine power loss

Dirty air filter - Clean or change.
Dirty or damaged injection nozzles - Inspect nozzles and replace if necessary.
Uneven fuel injection pressure - Test fuel injection pressure and adjust it correctly.
The valve clearance is not adjusted - Have it adjusted.
Low idle speed adjustment is incorrect - Correct low idle adjustment.
Fuel hoses or lines are clogged - Clean fuel system hoses and lines.
Cylinder head gasket defective - Gasket should be replaced.
Piston rings are leaking or defective - Replace the piston rings as required.

Engine is overheated

Engine has a lack of coolant - Top up coolant fluid and check system for leaks.
Engine oil level low - Fill the crankcase with engine oil.
Dirty radiator fins or defective radiator cap - Clean radiator or change cap.
Fan belt slipping or worn - Replace the fan belt.
Diesel engine overloaded - Reduce load on the engine.

Oil pressure is insufficient

Oil level is low - Fill up the engine oil.
Engine oil filter is plugged - Change or clean engine oil filter element.
Different type of engine oil - Use oil of correct viscosity.
Crankshaft bearing oil clearance is incorrect - Replace bearings.
Defective oil pump - Inspect and change as required.

Abnormal engine noise or knocking

Not enough engine oil - Need to add engine oil.
Coolant temperature is low - Warm up the engine to required temperature.
Incorrect adjustment of fuel injection pump timing - Use the correct fuel injection pump timing adjustment.
Low idle speed setting is incorrect - Adjust low idling as recommended.
Dirty or defective injectors - Replace fuel injectors.
Connecting rod is not aligned or worn - Align or replace connecting rod.
Worn or broken pistons - Have pistons replaced.

Drive System Troubleshooting

Drive system will not operate in either direction

Low hydraulic oil level - Need to add oil.
Damaged or jammed track mechanism - Repair or fix jamming.
Stuck relief valve - Change or repair defective relief valve.
Hydraulic filter or suction line is dirty - Clean suction line or change hydraulic filter.
Hand or foot controls failure - Change or repair.
Drive motor or pump failure - Check and repair if required.

Machine won't drive straight or drives jerkily

Undercarriage tracks are jammed or defective - Remedy jamming or repair tracks.
Sagging or worn tracks - Adjust track sag with tensioning or replace tracks.
Debris, dirt, or foreign objects jammed in undercarriage track frame - Clean undercarriage track frame, remove foreign objects and debris.

Loss of power

Clogged hydraulic oil filter - Change hydraulic filter.
Relief valve is open or worn - Replace or close relief valve.
Worn or defective transmission parts - Inspect and replace defective parts.
Input drive shaft is defective - Faulty drive shaft need to be replaced or repair.
There is air in the hydraulic system - Air bleeding is required.

Drive system keeps overheating

Hydraulic fluid level low - Check and refill the hydraulic fluid.
Hydraulic fluid filter is dirty - Change or clean hydraulic filter.
Relief valve is worn or damaged - Change or repair defective relief valve.
Worn hydraulic motor or drive pump - Check and repair if required.
Dirty oil cooler - Clean cooling fins as required.
Drive system overloaded continuously - Reduce the load.

Excessive noise

Wrong oil viscosity - Use oil of proper viscosity.
Air leaks in hydraulic system - Air bleeding is required.
Hydraulic motor or drive pump failure - Repair or change faulty component.
Worn or defective mechanical components of drive system - Check the parts for defect or damage and change if required.

Hydraulics Troubleshooting

Hydraulic system overheating

Incorrect hydraulic pressure setting - Adjust pressure correctly.
Main relief valve malfunction or improper adjustment - Adjust or replace the relief valve.
Hydraulic fluid contamination - Change hydraulic fluid.
Lack of hydraulic fluid - Add fluid to the hydraulic system.
Worn hydraulic oil pump - Install new pump or repair it.

Lift arm does not lower or raise

Lift controls malfunction - Change or repair.
Hydraulic pump failure - Replace or repair pump if necessary.
Hydraulic control valve failure - Install a new valve or repair it.
Hydraulic cylinder failure - Repair or replace hydraulic cylinder.
Hydraulic oil level low - Need to add oil.

Bucket is not working

Damaged bucket controls - Change or repair.
Hydraulic pump malfunction - Repair or replace pump if necessary.
Defective hydraulic control valve - Repair or change the valve.
Broken bucket cylinder - Install a new cylinder or repair it.
Low hydraulic oil level - Check and refill the hydraulic oil.

Bucket or lift arm runs slowly

Worn hydraulic oil pump - Test pump performance and replace pump if necessary.
Hydraulic cylinder oil leakage - Install new cylinder seals.
Hydraulic fluid level low - Checking hydraulic fluid level and add if necessary.
Worn or unadjusted hydraulic control valve - Repair or set correctly.
Hydraulic pressure is low - Correct setting is required.

Bucket or boom jerks when working

Air in the hydraulic system - Bleed air from system.
Hydraulic oil filter element is clogged - Clean or replace the filter.
Hydraulic oil is contaminated - Hydraulic oil change required.
Cylinder tube or rod is scored - Change damaged component.

Hydraulic pump makes excessive noise

Insufficient oil level or leaking hydraulic system - Remedy hydraulic leakage or refill oil as necessary.
Hydraulic filter clogging - Change or clean oil filter.
Clogged suction line - Suction line needs to be cleaned.
Pump sucks air - Bleed air.
Worn pump components - Change or rebuild pump.

Electrical Troubleshooting

Battery does not charge

Electrical wire connections are corroded or loose - Tighten or clean connections.
Defective electrical terminal connectors - Terminal connectors should be replaced.
Battery is worn - Replace the battery.
Loose or worn belt - Adjust belt tension or replace belt.

Starter motor turns slow

Battery power is low - Low battery charging, charge as required.
Battery discharges quickly - Service charging system or replace battery.
Bad battery terminals or disconnected wiring - Connect wiring properly or install new terminals.

Starter does not work

Battery is drained or worn - Need to charge or replace the battery.
Battery cables are disconnected or incorrectly connected - Check cables and connect as needed.
Battery capacity is low - Battery is drained, recharge it.
Defective starter motor - Starter should be changed.